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How to Install a Laser Scanner Assembly in the Brother HL-1870N Laser Printer

In the first step of the replacement procedure, you must turn the laser printer off, and then unplug the power cord. Next, you must remove the drum unit and toner cartridge assembly, the paper cassette, the network board, the top cover, the DX feed assembly, the rear cover, the rear left cover, the rear right cover, the right side cover, the left side cover, the MP cover assembly, and the process unit from the Brother HL-1870N Laser Printer. After that, you must release the harness and the fan relay PCB assembly from the main unit by loosening the cup screw, and remove the three screws securing the exhausted laser scanner assembly to the printer frame. Now, you must release the harness cover by pushing it to the right, and then remove it from the main unit. In the next step of the replacement procedure, you must unplug the LD harness and the polygon motor connector, and then remove the exhausted laser scanner assembly from the Brother HL-1870N Laser Printer. Please avoid touching the lens and the mirror. Finally, you must unpack the new laser scanner assembly, and then install it by executing the current procedure in reverse order.